Tough one, as I'm sure there'd be many out there who would disagree with me on this regardless of what numbers I'd throw out here. Maybe anywhere between four to six years?

That aside, term limits across the board would be a good idea.

I honestly don't think it matters. If the elected official is amazing then you're doing yourself a disservice my forcing them to retire (and also now paying benefits to yet another person who ultimately takes their place). If they're bad, but keep getting elected, it's an indication that the electorate in their district/state is full of stupid people that will continue to elect assholes anyway, so you're still likely to have someone shitty in office no matter what (plus, again, paying more benefits).

I would also like to see a ten year limit for SC justices.

I think 12 is good also, and I think there should be a good long period after that they would have to wait before being hired as a lobbyist- maybe 10 years.